A member asked:

My 5 yr. old has immovable, painless, knot to back of his head. its been there for 4 days. he said he didn't hit his head what should i do?

2 doctors weighed in across 2 answers
Dr. Oscar Novick answered

Specializes in Pediatrics

No urgency: As long as he is not complaining and he is playful bring it up for discussion at your next doctors visit.

Answered 7/17/2013

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Likely a lymph node: There are thousands of lymph node located around the body that help screen out germs in the body serum before it returns to the circulation. There are many in the neck, head and behind the ear. At rest these are often 1/4 inch in diameter and may grow to marble sized when reacting to a stimulus. Bug bites, or viral infections can increase their size.

Answered 12/9/2013

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